期刊
POLYMER TESTING
卷 93, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.polymertesting.2020.106957
关键词
Electrospun fibrous membrane; Oxygen sensitive nanofibers; Optical sensor; Ratiometric imaging; Food respiration monitoring
资金
- National Natural Science Foundation of China [21374008, 51873214]
Self-referenced photoluminescent oxygen sensitive fibrous membranes were successfully prepared for evaluating the freshness of agricultural products by monitoring the concentration change of environmental oxygen in packaged fruits. This study demonstrates the potential of using such membranes as an optical oxygen sensor for agricultural applications.
During the storage of agricultural products, the oxygen concentration in the packages represents the level of food respiration and hence indicates its freshness. Herein, self-referenced photoluminescent oxygen sensitive fibrous membranes were prepared, with the inclusion of an oxygen-sensitive probe, i.e. tris (4,7-diphenyl-1,10-phenanthroline) ruthenium (II) dichloride (RuDPP), with an oxygen-insensitive luminophore, i.e. silane-functionalized carbon dots (SiCDs). Silicone was selected as the matrix, obtained via sol-gel process, and was electrospun to get nanofibers containing mesoporous microstructure and with high oxygen permeability. The as-prepared RuDPP@SiCDs/SiO2 fibrous membranes possessed hydrophobicity and exhibited ideal oxygen sensitivity, which realized a remote evaluation of the freshness of packaged fruits, through ratiometric photoluminescence imaging on the concentration change of environmental oxygen. The results indicate that such kind of oxygen-sensitive fiber membranes are capable as an optical oxygen sensor for agricultural applications.
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